/*
 * Copyright (c) 2012 Robert Burrell Donkin robertburrelldonkin.name
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
 * and associated documentation files (the "Software"), to deal in the Software without restriction, 
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software 
 * is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or 
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 */
package name.robertburrelldonkin.alfie;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;


public class Engine<Subject, Result> extends MediaryCog<Subject, Future<Result>> {

	private final ExecutorService executor;
	private final Actor<Subject, Result> actor;
	public Engine(BlockingQueue<Message<Subject>> in, 
			ExecutorService executor, Actor<Subject, Result> actor) {
		this(in, null, executor, actor);
	}
	
	public Engine(BlockingQueue<Message<Subject>> in,
			final BlockingQueue<Message<Future<Result>>> out, 
			ExecutorService executor, Actor<Subject, Result> actor) {
		super(in, out, DEFAULT_TIMEOUT);
		this.executor = executor;
		this.actor = actor;
	}
	
	@Override
	protected void communicate(final Subject subject) {
		if (subject != null) {
			final Future<Result> future = executor.submit(new Action<Subject, Result>(subject, actor));
			postSubmit(future);
		}
	}

	private void postSubmit(Future<Result> future) {
		out(future);
		postSubmitHook(future);
	}

	protected void postSubmitHook(Future<Result> future) {}
}
